Thanks for all the support and info! I have fostered baby kittens and baby bunnies before but never yorkies. I guess I was just worried after the one I saw at the humane society that they would all pretty much be like that. I don't mind some behavior problems but if it's gonna be a situation where the foster makes my current dog misrable I couldn't do that to poor Chibi. I might try it and see how it goes, I guess I was just nervous and needed some reasurring words 
